Warp stop motion for looms



s. Snwsom. WARP STOP MOTION FOR LOOMS.

Patented June 6, 1922.

UNITED" STATES PATENT EDWARD s. STIMPSON, or HQPEDALE, MAssAcrr snrrs, assre von' To. s teen CORPORATION, or HOPEDALE, MASSACHUSETTS, n; CORPORATIONiOE MAINE-r I 1 .v w

WARP s'ror MOTIO'N' ron rooiyrs. i

To all whom z't may concern: l

Be it known that I, ED ARD b. STIMPSON,

a citizen of the United States, residing at ,Hopedale, in the county of Worcester and .State of Massachusetts, have invented an Improvement in lVa'rp Stop Motions for Looms, of which the following description, in connection with the accompanying drawings,is a specification, like characters on the drawings representing like parts.

' This invention relates to warp stop motions'for looms, and ,more particularly to the drop wires employed in such mechanisms. i

' Inthat typerof warp stop motion wherein the drop wires are supported by the warp thread during weaving and'are dropped or released when a warp thread becomes broken or too slack for weaving purposes, it is the common practice to'stri'ng the drop wires upon drop wire guides or" bars which not only serve to guide the drop wires in their vertical movements, but also to receive the pressure of the feeler when it is stopped by a dropped wire. a I,

Should the pressure of the feeler'against the drop wire twist or deflect the latter relatively to the drop-wire guide, the feeler will fail to be arrested, and the loom-will continue to run and weave imperfect cloth; The

slot or opening in the drop wire is died out or stamped, and must be'made-with considerable accuracy because, should it be formed to fit too snugly, the drop wire'will not dropto its proper stopping position, in which case the loom would fail to be stopped, and imperfect cloth would be woven. On

the other'hand, if the amount of clearance between the guide and the-walls of the drop wire slot is made sufliciently large to insure proper dropped position'of the drop wire' when released by a warp thread, the drop wire is liable to be twisted or turned about a vertical axis under the pressure of i the feeler, in which case the loom will again continue to run and produce imperfect cloth.

The die by which the slot in the drop, wire isformed is sharpened or ground'from time to time, with the'result that should the slot in any set of drop wires first made by the die fit the drop wire guide with suiiicient accuracy to prevent either of the above-named objections, the drop wires which are'later produced by the same die after it has been ground Orsharpened, would be too'loose,

Specification of Letters Patent. n ne Application fi1ed-August22, 1921. seria'in 1494,2975

or turn on the drop wire guide fandrfail to stop the loom.

It is-important, therefore, that thedropf wires be so formedthat regardless of'cany variation in the side" of the drop 'wir'e'slot dueeither towear or by grinding of thedie which cuts the slots, thepressurewall ofthe" slot (that is, the wall which transmits 'the pressure of the feeler' tothe'feeler guideli,

shall bear firmly upon the adj acent'fwallof the drop w'iv'ire guide when in its dropped position? the idr'op wire is,

An important feature'gof the present Q .vention, therefore, consists of a'dropiwire, having'a drop wiregulde slot ;or' opening, p,

the bearing wall of whichis vertical and-the oppositev or ,positioningwall of whichi'ijsjim. 'i'

clined 'to the" vertical and converges i upwardly relative to the bearing wall', thejc on-f struction being such ,"that" the, positioning wall insures a firm contact of the opposite width of the dropfwire' slot or opening.

The invention will bestQbe understood bearing wall withftheadjacentfsurface of the guide; regardless of ivariations in; the

form thereof, wherein I Figure 1 is a sectional viewer a portion of. a warp stop 1 motion, ishov'vingQthe dropwires in their lowered or stopping position Big-.12 is a partial'plan vie'wfof showing more particularly one of thedrop wires in its"droppe d position and the fejeler -being arrested in its feeling movement.

' The warp stop mechanism may comprise the "side-supports 1 carryingv'the warp' sup porting rods: 2 over] which pass theifwarp threads The side supports l fur nishya convenient means for supporting the'feeler slide 4 on which are,;mounted the feelers 5'; I In the present instance of the invention the feelers 5 are indicated as inclined to the verti-- I cal, and as having the vertical walls 6 for engagement with .thedrop, wires as will later" be explained; but so:fa'ras the present inventionis concerned, the feelers maybe of any of the well known and usual types, wherein they are given a detecting or reciprocating movement towardand from the'dr'op wires. 1

In this respect thesifde supports 1, the feeler' carrier slides fk-and the feelers 5, maybe sub;

55 and on pressure'of the feeler, it" would twist stantially more fully described in the application of Edward S. Stimpson, Serial Number 174,868, filed June 2, 1921.

Extending between the side supports 1 of the warpstop -mechanism are the drop wire guides 7, which pass through slots 8 extending longitudinally of the drop Wires. In the v form of drop wire shown, each is provided with an opening 9through which'one of the warp-threads 3 passes,but so far as thepres-' ent invention is concerned, this feature of the drop wire maybe of any usual or well lrnown construction, the sole requirement being that the drop wires maybe normallyheld in their raised position by normal warp threads.

.Each of the drop wires is provided with anenlargedheadlO which, when-a drop wire is dropped by a broken ortoo slack warp thread, is engaged by'theassociatedfeeler 5 to effect loom stoppage.

The construction ofthe drop Wires and dropwireguides as thus far described may be the same as well known in the .prlor art andas illustrated Fig.3. "In the old form of drop wires, the UPPGlvPOlblOH ,of'the slot or opening ina drop wire has usually been formed .with the sidewalls substantially par- I alleltothead j a cent surfaces of the drop wire guide with a comparatively large amount of clearance between the walls and the sides of the drop wire guide and when the feeler has engaged the upper portionv of the drop wire "span the breakage of a warp thread, the drop wire has been unable to support the pressure of the feeler without twisting movement, the

result being t-hatthe feeler has not been arrested-and the loom has continued to run. l he twisted or turned condition of the drop wire'fis well indicated in Figs. 4; and '5.

In the. present invention, that portion of the opening in the drop wire which is engagedby the drop wire guide when the drop wire has been released bya broken orv unduly 's-lack warp' thread, is formed with-a bearing wall 15 which bears against the surface 16 of thedrop Wire guide when the drop wire is in its lowere'dpo'sition as indicated in Fig. 1.

jacent surface 18 of the drop wire guide when the drop wire is in its lowered position. The

, construction is such that the vertical bearing wall 15. is always brought into close contacting relation with the adjacent surface 16 of the drop Wire guide by the action of, the inclined positioning walll? when a drop wire is released by a warp thread, and consequently all clearance between thebearing wall 15 and the adjacent surfaces 16 of the drov wire uide is taken u) re ardless of any variation in size of the slot between the bearing and positioning walls 15 and 17, re-

spectively. W hen pressure is exerted by the feeler 5 against a lowered drop 'wire,"as indicated in Fig. 1, 'and the bearing wall 15 is held firmlyagainst the adjacent surface: of the drop wire guide by the opposite inclined positioning surface 17, the drop wire isfirmly held and prevented from being twisted or deflected by the feeler, and the loom is unerringly stopped, 1 I

- Asihereinbefore mentionechthe drop wires are died out and it becomes necessaryfrom timeto time to grlnd or sharpen the die.

Theresult. is that the width of the opening in the drop wires between the bearing and positioning walls 15 and 17,w1ll vary. This opening in the drop wires which are died out after the die has been. ground or sharpened, will be somewhat wider than the openingin the drop wires which are died out prior thereto; and where, the opening inthe drop wires is of the old form, as indicated in Fig. 3, the later-died-out drop wires'have so much clearancebetween "the walls of the opening and the drop wire guide that they become deflected and twisted under the ac tion of the feeler.

detector are so related hereinbefore de-' scribed, that even thoughthe distance betweensaid wallsle and 117 may vary, the bearing. wall Iii-will always be forced into intimate bearing and flush Contact with the In accordance with the present invention, however, the bearing wall and the positioningwall of the slot inithe adjacent wall 16 of the drop wire guide, so

that the drop wire .isalways held firmlyzin position to resist the pressure exerted by the feeler, without twisting.

The effect of the different widths in the upper portion of the openings in drop wires inadeby the die before and. after sharpen-v ing, is indicated in Fig. 1,.wl 1erein the drop wire at the left is typical of those died out prior to the sharpeningof the die, whereas those atthe right typify drop wires died out after the die has been ground or sharpened. In either case,,however, the bearingsurface 15 is caused to contact firmly with'a-nd be clamped upon the adjacent surface 116 of the guide and consequently prevent deflection or twisting of the drop wire under the pressure of the-feeler. I i

What is. claimed is 1. In a warp stop motion for looms, the

combination ofa drop wire having an opening provided with a bearing wall extending parallel to the longitudinal axle of the drop wire and an opposite positioning wall in clined to the longitudinal axis of the drop wire and converging upwardly toward the bearing wall, a drop wire guide extending through the'opening of the drop wires and having a face adapted to engage the bearing feeler arresting portions and each having an opening provided with a vertical bearing wall adjacent the feeler arresting portion and an opposite positioning wall inclined to and converging upwardly toward the vertical bearing wall, a drop wire guide extending through the opening of the drop wires and having a straight face adapted to engage the bearing wall of the opening and back up the drop wire opposite and against the pressure of the feeler, and a portion adapted to engage the inclined positioning wall of the openingwhen a wire fails to be held raised by a warp thread, that the inclined positioning wall of the opening may cooperate with the guide to hold the verticalbeari'ng wall of the opening in firm engagement with the straight face of the guide.

8. In a warp stop motion for looms, the combination of a feeler, a series of drop wires having laterally extending enlargements "and provided With an elongated guide slot the wall of which at the side of the elongated slot adjacent to the enlargement is projected toward the opposite straight wall of the elongated slot, andav guide bar for engaging the projected wall of the slot for backing the.

In a warp stop motion for looms, the combination of drop wires provided with enlargementagainst the lateral pressure of the feeler and moving the drop wire laterally. as it drops into the path of the feeler.

L'In a warp-stop motion forlooms, the

combination of a feeler, a series of'drop wires having narrow and wide portions .and'each provided with an elongated" guide slot, one

wallof which at the side ofthe elongated slot. adjacent the wide portion of the drop wire is inclined and converges upwardly to ward the opposite straight bearing wall, a guide bar for engagingthe bearing wall of the slot whenadropwire is released by a warp thread to position the wide portion of the drop wire for contact'by the feeler, said i guide bar at such times backing the wide portion of the drop Wire against the pressure, of thefeeler. v I f 5. In awarp stopvmotion for looms, the

combination of a feeler having a detecting movement above the plane of thewarpj '60 threads, a series of drop wires having narrow and wide portions and each provided with an elongated guide slot, one wallof which at the side of the elongated slot adja-j cent the Wide portion of the drop wire is inclined and converges upwardly toward the opposite straight bearing wall, a guidebar for enga ing the bearing wall of the slot when a drop wire is released by a warp thread to position the wide POItlOIlOf the drop wire for contact by the feeler, said guide bar at such times backing the wide portion of the drop wire against the pressure of the feeler.

In testimony. whereof, I have signed my name to this specificatio v EDWARD s. s'rIMPso I, I j. 

